[Chromium] [PowerProfiler] Support accuracy level attribute for power data provider.

content/browser/devtools/devtools_power_handler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_POWER_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_POWER_HANDLER_H_
 
 #include "base/time/time.h"
 #include "content/browser/devtools/devtools_protocol.h"
 #include "content/browser/power_profiler/power_profiler_observer.h"
@@ skipping 11 matching lines @@
   // PowerProfilerObserver override.
   virtual void OnPowerEvent(const PowerEventVector&) OVERRIDE;
 
  private:
   scoped_refptr<DevToolsProtocol::Response> OnStart(
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> OnEnd(
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> OnCanProfilePower(
       scoped_refptr<DevToolsProtocol::Command> command);
+  scoped_refptr<DevToolsProtocol::Response> OnAccuracyLevel(
+      scoped_refptr<DevToolsProtocol::Command> command);
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsPowerHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_POWER_HANDLER_H_